[CI] Adds Code Generation tests on Github Actions (#6482)

Moves check-grpc-generation to scripts

grpc/examples/generate.sh

@@ -1,3 +1,21 @@
+#!/bin/bash
+#
+# Copyright 2021 Google Inc. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -e
+
 current_dir=`pwd`
 
 cd ../..
@@ -6,7 +24,17 @@ main_dir=`pwd`
 
 cd ${current_dir}
 
-alias fbc='${main_dir}/Debug/flatc'
+# Looks for flatc within the root dir & debug
+if [ -e ${main_dir}/flatc ]; then
+  alias fbc='${main_dir}/flatc'
+elif [ -e ${main_dir}/Debug/flatc ]; then
+  alias fbc='${main_dir}/Debug/flatc'
+else
+  echo 'flatc' could not be found. Make sure to build FlatBuffers from the \
+       $rootdir directory.
+  exit 1
+fi
+
 generator="--grpc $current_dir/greeter.fbs"
 
 # Regenerate Go lang code